Using lineage to infer data quality issues

ABSTRACT

Identifying data quality along a data flow. A method includes identifying quality metadata for two or more datasets. The quality metadata defines one or more of quality of a data source, accuracy of a dataset, completeness of a dataset, freshness of a dataset, or relevance of a dataset. At least some of the metadata is based on results of operations along a data flow. Based on the metadata, the method includes creating one or more quality indexes for the datasets. The one or more quality indexes include a characterization of quality of two or more datasets.

RELATED APPLICATION

This application is a continuation of and claims priority to U.S.application Ser. No. 14/264,966, entitled “USING LINEAGE TO INFER DATAQUALITY ISSUES,” filed Apr. 29, 2014, the contents of which areincorporated herein by reference in its entirety.

BACKGROUND Background and Relevant Art

Computers and computing systems have affected nearly every aspect ofmodern living. Computers are generally involved in work, recreation,healthcare, transportation, entertainment, household management, etc.

Quality is an important characteristic in building trust with a set ofcomputing data. There are many tools for assessing the quality of agiven dataset and for suggesting or automatically improving the qualityof the data in a dataset. However, these tools perform specific actionson the dataset itself, which itself requires that the tool has directaccess to the dataset in its entirety.

The subject matter claimed herein is not limited to embodiments thatsolve any disadvantages or that operate only in environments such asthose described above. Rather, this background is only provided toillustrate one exemplary technology area where some embodimentsdescribed herein may be practiced.

BRIEF SUMMARY

One embodiment illustrated herein includes a method that may bepracticed in a data processing environment with data flowing from one ormore sources through a plurality of operations, a method of identifyingdata quality along the data flow. The method includes identifyingquality metadata for two or more datasets. The quality metadata definesone or more of quality of a data source, accuracy of a dataset,completeness of a dataset, freshness of a dataset, or relevance of adataset. At least some of the metadata is based on results of operationsalong a data flow. Based on the metadata, the method includes creatingone or more quality indexes for the datasets. The one or more qualityindexes includes a characterization of quality of two or more datasets.

This Summary is provided to introduce a selection of concepts in asimplified form that are further described below in the DetailedDescription. This Summary is not intended to identify key features oressential features of the claimed subject matter, nor is it intended tobe used as an aid in determining the scope of the claimed subjectmatter.

Additional features and advantages will be set forth in the descriptionwhich follows, and in part will be obvious from the description, or maybe learned by the practice of the teachings herein. Features andadvantages of the invention may be realized and obtained by means of theinstruments and combinations particularly pointed out in the appendedclaims. Features of the present invention will become more fullyapparent from the following description and appended claims, or may belearned by the practice of the invention as set forth hereinafter.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to describe the manner in which the above-recited and otheradvantages and features can be obtained, a more particular descriptionof the subject matter briefly described above will be rendered byreference to specific embodiments which are illustrated in the appendeddrawings. Understanding that these drawings depict only typicalembodiments and are not therefore to be considered to be limiting inscope, embodiments will be described and explained with additionalspecificity and detail through the use of the accompanying drawings inwhich:

FIG. 1 illustrates a dataflow of data through various operations;

FIG. 2A illustrates an example of determining dataset quality;

FIG. 2B illustrates an example of determining dataset quality;

FIG. 2C illustrates an example of determining dataset quality;

FIG. 2D illustrates an example of determining dataset quality;

FIG. 2E illustrates an example of determining dataset quality;

FIG. 3 illustrates a dataset that is composed of a number of differentdatasets, where each dataset has its own quality associated with it;

FIG. 4 illustrates a method of identifying data quality along a dataflow

DETAILED DESCRIPTION

Some embodiments described herein use an inferred approach to assertingthe quality of a dataset so that direct access to the data contained inthe dataset is not needed. While this is not an authoritative assertionof quality, this metric can be used by data consumers to inform theirlevel of trust with a dataset

In some embodiments, the lineage of a data source is used to infer thequality of the data source and also to report quality issues of a datasource. Metadata about datasets can be associated with the datasetsbased on the lineage of the data and/or operations performed on thedata.

Data lineage is the representation of how data moves through a system ofconnected data stores. An example is illustrated in FIG. 1. FIG. 1illustrates various data sources including a web source 102, a databasesource 104, a spreadsheet source 106, and a text source (such as a textdocument) 108. Data from one or more of the sources may pass through oneor more ETL (extract-transfer-load) processes (such as those in SQLServer® Integration Services, available from Microsoft Corporation ofRedmond, Wash.), illustrated generally at 110. Various forms of inputdata may further travel along a dataflow 100 such as for example througha web service 112, to an analytic service 114, through a sharing service116, through another spreadsheet 118, and finally be incorporated into areport 120.

In this case, the lineage of the data includes the web source 102, thedatabase source 104, the spreadsheet source 106, the text source 108,the processes 110, the web service 112, the analytic service 114, thesharing service 116, and the spreadsheet 118. At each point in thelineage, the data has the opportunity to be transformed or changed.

Data sources, transformation, and/or operations can also be annotatedwith metadata. For example, FIG. 1 illustrates each of the data sources102, 104, 106, and 108 associated with metadata 142, 144, 146, and 148respectively. One piece of metadata that can be captured is the dataquality level of the data in the data source. Data quality, can, butdoes not necessarily have a pre-defined metric. This metric can be asimple enumeration of High, Medium, or Low, or it can be a percentcorrect, a percent that follow a certain pattern, a percent complete, arelevance score, a freshness score, a grading based on granularityavailable, a precision score, etc.

In particular, data quality may be related to any of a number ofdifferent factors. One such factor may be correctness of data. Forexample, data should accurately reflect what it purports to representwithout errors.

Another factor may be completeness. Completeness relates to theinclusion of what might be considered important, necessary, and/oruseful to be included in a dataset. For example, address data shouldinclude street address, zip code, city, and state. If these cannot beidentified in a data set, the data set may be of a lower quality. On alarger scale, a data set may have reports from several entities. Ifcertain reports from certain entities are not included, then the datamay have a lower quality as not being complete. On an even larger scale,statistical data may be included for countries. If data for one or morecountries is missing, then the data may be determined to not becomplete.

Another factor may be relevance. Relevance could represent any one of anumber of different things. For example, more socially “popular” datasources may be more relevant than other sources. Relevance may also bedetermined based on context. For example, in a system dealing withscientific observations, a data source mostly dedicated to music salesmight be of less relevance.

Another factor may be freshness. Freshness refers to how recent the datais. This factor may vary based on the data source. For example, a datasource having historical facts may not need to be updated as often as acurrent stock price data source to be considered “fresh”.

Another factor may be granularity of what data is available. Forexample, a data source may be able to provide a broad range ofgranularity such as data representing an aggregation of data points aswell as data about the individual data points. For example, a coarsegranularity of data might indicate that 500,000 people purchased aparticular product. A much finer granularity of data might indicate thatJoe Smith purchased the particular product. Data stores able to providea broad range of granularity may be higher quality data stores.Alternatively, data stores able to provide finer granularity of data(e.g. lower-level or more precise data) may be higher quality datasources than those that provide coarser granularity of data, as thecoarser granularity data can be easily created from fine granularitydata.

Another factor may be precision. For example, data sources that providedata that is more precise may be of higher quality. For example, if asystem provides scientific measurement data, a system that providesfiner precision may be a higher quality system that one with more coarseprecision.

Another factor may be reputation of a data source. For example, awell-known and respected news source may be annotated as having highquality data while a lesser known news source may be identified ashaving lower quality data.

Yet another factor may be related to who prepared, used, or otherwiseinteracted with the dataset. For example, the reputation or stature ofthe owner of the dataset may be taken into account. Alternatively oradditionally, entities who have been looking or using a dataset (and insome cases how they use the dataset) may be used to determine quality orrelevance. Embodiments may allow for a sort of “crowd source” qualityassessment.

Determinations as to the quality of a dataset may be made in any of anumber of different ways. For example, simple threshold or comparisonsmay be made to assign a data source a data quality rating.Alternatively, Bayesian inference or machine learning may be used toresolve data source ratings. In another example, a user can manuallydetermine quality and make an assignment of a data source qualityrating.

Data sources can also be annotated with information about whether theyare a data cleansing process which can occur as part of a data transformor as an action taken on a specific data source. For example, FIG. 1illustrates that the web source 102, the database source 104, thespreadsheet source 106, and the text source 108 each have associatedwith them a data cleansing process 122, 124, 126, 128 respectively. Thedata cleansing processes 122 through 128 are configured to automaticallyidentify and correct problems with data from the data sources 102through 108. Thus for example, datasets 132, 134, 136, and 138 can besent from data sources 102, 104, 106, and 108 respectively. The datasources have associated with them data cleansing processes 122, 124,126, and 128. The data cleansing processes 122, 124, 126, and 128, canreceive the datasets 132, 134, 136, and 138 respectively, and identifyissues such as incorrect or corrupted data, incomplete data, outdateddata, non-relevant data, etc. and can perform corrective techniques suchas filtering, data supplementation, re-requesting data, etc. to improvethe quality of the datasets 132 through 138. FIG. 1 also illustrates amanual data cleansing process 130. The manual data cleansing process 130can be initiated by a user to perform various data cleansing orverification processes.

Using data lineage and information about data sources and annotatingdata assets with metadata about data quality, it is possible to useinference, machine learning, or other techniques to determine relativemeasures of data quality for datasets where no explicit assertion hasbeen made. One can also use these techniques to infer data qualityreporting problems or report on how resources allocation is being usedwith respect to maintaining data quality. This can be used to improvedata quality reporting and/or resource utilization directed to dataquality improvement.

Determining Data Quality

Most basically, data quality can be inferred from assertions aboutquality from which the data flows. For example, reference is directed toFIG. 2A. In FIG. 2A, the quality of the dataset DS2 illustrated at 202is inferred to be <high> because the quality of the incoming data fromthe dataset DS1 illustrated at 204 is known to be high. A similarinference can be made with a low quality data source.

When there are multiple data sources, an inference can be made when allof the incoming data sources agree on the quality of the incoming data.For example, FIG. 2B illustrates an example where a dataset DS1illustrated at 206 and a dataset DS2 illustrated at 208 are both highquality datasets. As such, a dataset DS3 illustrated at 210 derived fromthe datasets DS1 and DS2 can also be inferred to be a <high> qualitydataset.

In alternative embodiments, various other algorithms may be used todetermine data quality. For example, complex algorithms may be able tomake a determination as to data quality based on the type of source, thequality of the source, the particular mix of sources being used (e.g.low quality sources that complement each other could be used to createhigh quality data, alternatively high quality sources that aredeleterious to each other may actually cause output data to be lowquality), etc. In some embodiments, these determinations may beaccomplished using machine learning and/or statistical analysis, such asBayesian inference.

Reporting Data Quality Issues

Embodiments can include functionality for detecting data quality issues.Just as inferences can be made about the quality of a dataset, a systemcan detect potential quality problems when an inference or otherdetermination of data quality does not match what is otherwise assertedabout a dataset. For example, as illustrated in FIG. 2C, when a datasource DS2 illustrated at 212 is annotated as having a high dataquality, but is fed by a data source DS1 illustrated at 214 that has alow data quality and no data cleansing process is present, the systemcan report that that data source DS2 may have an inaccurate data sourceannotation of “high”. This same principle applies whether the incomingdata source is from a single source or multiple data sources.

Reporting may include generating a data quality index that includesindications of quality for different datasets. For example, asillustrated in FIG. 1, a computing system 170 may be configured togather quality metadata 142, 144, 146, and 148 from the sources 102-108respectively. The computing system 170 may also be able to gatherquality metadata 150, 152, 154, 156, and 158 from various services 110,112, 114, 116, and 118 respectively that indicates expected quality ofdatasets (or in some cases, actual measured or otherwise determinedquality of datasets). The quality metadata can be assembled into one ormore indexes, such as index 172, that can be used for evaluationpurposes. As explained in other portions of this document, the index canbe used to determine where cleansing resources are being used, whencleansing resources are ineffective, discrepancies between expected dataquality and actual data quality, etc. In some embodiments, the index canbe used in system learning, such as, for example, via a machine learningprocess or explicit rule. For example, learning process or rule may notethat the combination of two ‘low’ quality datasets combined in aparticular way can produce a high quality dataset as output. Wheneverthe system observes this pattern being used again (those same two lowdatasets being combined in the same way), the new output is also likelyhigh quality

Reporting Resource Allocation or Problems with Cleansing

Based on annotations about data cleansing processes, it is possible togenerate a report of where cleansing is taking place. With suchinformation, determinations can be made about data cleansing resources.For example, embodiments can determine if data cleansing resources arebeing used efficiently. For example, an embodiment can determine if datacleansing resources are being allocated on high business impact datasources or low business impact data sources. This is done simply byquerying for where data cleansing processes are in a system andcorrelating this information with knowledge about the business impact ofa data source.

If cleansing resources are not being used effectively, the resources canbe reallocated. For example, if it is determined that cleansingresources are being used on low business impact data, the cleansingresources could be moved to higher impact data.

Similar detection and allocation could be performed for other datasetsbased on other factors. For example, it may be desirable to allocatedata cleansing resources based on frequency of use of the dataset. Forexample, data cleansing resources may be more effectively used ondatasets that are accessed more often rather than those of that are usedless often. Similar embodiments may be implemented in social networkingenvironments. For example, datasets that are shared or “liked” moreoften may be benefited by allocating data cleansing resources to cleansuch datasets while the allocating resources to datasets that are sharedor “liked” less often.

In another example, datasets used by high level end users may havepreference for high quality over datasets that are only used by lowerlevel users. For example, the CEO of a company may review certainreports. It may be important for these reports to be assembled usinghigh quality datasets. Thus, if it can be determined that data cleansingresources are being used for lower level employees, the data cleansingresources can be reallocated for datasets used to create reports for theCEO or other upper level management.

Embodiments can determine the effectiveness of data cleansing processesand where “low quality” data is being introduced. This can be done bylooking for lineage patterns where data comes out of a data cleansingprocess and flows to a data source that is still marked as having a“low” data quality. In these cases, any cleansing process is eitherineffective or there is a new, undocumented source of low quality databeing introduced that can be addressed.

For example, FIG. 2D illustrates an example where a dataset DS1illustrated at 216 marked as having high quality data is used to createa dataset DS2 illustrated at 218 identified as having low quality data.For example, an audit may be performed on the dataset DS2 illustrated at218 to determine the quality of the data in the dataset. However, simplyusing the lineage information yields incorrect quality information aboutthe dataset DS2 illustrated at 218. This may be caused, for example byanother unknown dataset DS3 illustrated in phantom at 220 thatintroduces lower quality data into the dataset DS2 illustrated at 218.

Alternatively, there may be some transformation process (not shown) usedin creating the dataset DS2 illustrated at 218 from the dataset DS1illustrated at 216 which degrades the quality of the dataset DS2. Forexample, the transformation may incorrectly perform a calculation,remove important portions of a data item (e.g. all zip codes fromaddresses), introduce indexing errors, perform invalid calculations(e.g. multiplying all revenue by 2), etc.

Alternatively, as illustrated at FIG. 2E, a cleansing process may not beproviding a desired effect. For example, as illustrated in FIG. 2E, adataset DS1 illustrated at 222 is shown as being low quality. Thedataset DS1 is used to create a dataset DS2, which is also identified asbeing of low quality. A cleansing process 226 is applied to the datasetDS1 illustrated at 222. However, the dataset DS2 is still identified asbeing of low quality. However, inference or other determinationtechniques may indicate that the dataset DS2 at 224 should be highquality. The difference between the actual quality of the data and theinferred quality of the data may indicate a problem with the cleansingprocess 226 which may need to be troubleshot.

In some embodiments, a dataset may be of one quality level whilesub-components of the dataset may be of different levels. For example,FIG. 3 illustrates a dataset 300 having associated with it metadata 310indicating the quality of the data in the dataset 300. FIG. 3 alsoillustrates a number of other datasets 302, 304, 306, and 308 that arepart of the dataset 300. Each of the sub datasets 302, 304, 306, and 308have associated with them metadata in the metadata 310 (or in separatemetadata 312, 314, 316 and 318 respectively) that identify data qualityfor the sub datasets. For example, the dataset 300 may have generally ahigh quality, but may include sub datasets (one or more of 302, 304,306, or 308) that have lower qualities.

Thus, embodiments may implement a two-dimension (or multiple dimension)quality index for datasets and their respective sub-datasets. Thus, forexample, a lineage signature (e.g. metadata) associated with a datasetincludes information of a data quality index for that dataset and a dataquality index for each of a plurality of sub-datasets of the dataset.

Illustratively, the dataset 300 may be a database. The database mayinclude a number of different columns represented by the datasets 302,304, 306 and 308. Certain columns may have incomplete rows or rows whichare not presently available. For example, certain rows of a column maybe locked by a transactional process or otherwise unavailable.Alternatively a column may have missing data for one or more rows. Anysuch column may be marked in metadata as having a lower quality.

In another example, the dataset 300 may include a store of flat filesrepresented by the datasets 302, 304, 306 and 308. Certain of the flatfiles may be incomplete or otherwise have undesirable characteristics.For example, certain files may be in draft form. Alternatively, certainfiles may be corrupted. Alternatively, certain files may have lessdetail. While the dataset 300 may be of an overall quality, individualdatasets within the dataset 300 may be of higher or lower qualities thanthe overall quality.

Thus data extracted from dataset 300 may have different qualitydepending on what data is extracted. Thus, even though the dataset 300may be annotated as having a certain quality, a different quality mayactually be realized when different portions of the dataset 300 areused.

Embodiments could ensure that data provided by the dataset 300 is highquality by selecting only sub datasets that are also marked as being ofhigh quality. Notably, the dataset 300 may be marked as low quality, butcould still provide high quality data by selecting sub datasets withhigh quality data. Alternatively, two (or more) low quality sub-datasetsthat have complementary data could be used to create a higher qualitydataset if the two (or more) datasets can compensate for each other'sdeficiencies.

Alternatively, embodiments may wish to custom tailor a quality level.This can be done by selectively choosing datasets of appropriate qualityto generate an output set of a particular quality. For example, theremay be cases where a data vendor provides different levels of data atdifferent costs. The data vendor can customize the quality of the outputdata by appropriate selection of data from sub datasets. Thus, forexample, a data vendor could provide premium data by only selecting datafrom high quality datasets within the dataset 300. Alternatively, avendor could provide low priced data by only providing data from lowquality datasets within the dataset 300. Alternatively, a data vendorcould provide moderately priced data by using moderate quality data inthe dataset 300 or by mixing data from different datasets within thedataset 300 to obtain the appropriate quality level.

Thus, embodiments may perform operations 320 against an input dataset300 and generate an output dataset 322. Embodiments may selectivelyadjust the data quality of the output dataset 322 to be higher or lowerthan the quality of the input dataset 300 depending on the quality ofsub-datasets involved in generating the output dataset.

The following discussion now refers to a number of methods and methodacts that may be performed. Although the method acts may be discussed ina certain order or illustrated in a flow chart as occurring in aparticular order, no particular ordering is required unless specificallystated, or required because an act is dependent on another act beingcompleted prior to the act being performed.

Referring now to FIG. 4, a method 400 is illustrated. The method 400 maybe practiced in a data processing environment with data flowing from oneor more sources through a plurality of operations. For example asillustrated in FIG. 1, data flows from sources 102-108 through variousoperations at various services 110-118 to generate a report 120. Themethod includes acts for identifying data quality along the data flow.The method includes identifying quality metadata for two or moredatasets (act 402). The quality metadata defines, for example, one ormore of quality of a data source, accuracy of a dataset, completeness ofa dataset, freshness of a dataset, relevance of a dataset, etc. At leastsome of the metadata is based on results of operations along a dataflow. For example as illustrated in FIG. 1, datasets 132-138 areillustrated as coming from sources 102-108 respectively. However,additional datasets 160, 162, 164, 166 and 168 may be produced, at theservices 110, 112, 114, 116, and 118 respectively, using the datasets132-138. Thus, quality metadata for the datasets includes some databased on metadata about sources and/or services in a dataflow.

The method 400 further includes, based on the metadata, creating one ormore quality indexes for the datasets (act 404). The one or more qualityindexes include a characterization of quality of two or more datasets.For example, FIG. 1 illustrates a quality index 172.

The method 400 may further include, based on the quality indexes,identifying one or more of positive, negative, neutral or unknowneffects of one or more given operations in the data flow. For example,if a dataset is identified as having low quality, an operation isperformed on the data to produce a new dataset with high quality, it canbe determined that the operation has a positive effect.

The method 400 may further include, based on the quality indexes,identifying incorrect metadata. For example, if a dataset identified asbeing of high quality is run through an operation that is known to be aneutral process for the dataset, and a dataset produced by the operationis found to be of low quality, it can be determined that qualitymetadata is incorrect. For example, the dataset input to the process maybe of low quality instead of the high quality identified.

The 400 may further include, based on the quality indexes, providing areal time indication of an operation result. For example, a userinterface may be able to indicate an operations effectiveness by someindication, such as for example, a green shading on a representation ofthe operation, or some other visual indication indicating the operationseffectiveness. If the operation does not perform a desired function withrespect to data quality, a representation of the operation may beindicated with a red shading or other appropriate output.

The method 400 may further include, based on the quality indexes,generating reports for operations. For example, a list of a set ofoperations may be generated. The list may indicate for each operation,that the operation is generally good, bad, neutral or that the effectsof the operation are unknown. Alternatively or additionally, a reportmay indicate a quantitative value indicating quantitatively howeffective an operation is. This can be used to identify operations thatmay need to have corrective actions applied to improve the operation'seffectiveness.

The method 400 may further include, based on the quality indexes,identifying operations to be applied to different data flows. Forexample, dataflows that have deleterious effect on data quality may beidentified. These dataflows may be identified as being good candidatesfor have having data cleansing processes applied to them.

The method 400 may further include, based on the quality indexes,identifying resources that are being underutilized. For example, datacleansing processes that are being used to clean data that is lowervalue than other data, data that is used less than other data, etc. canbe identified and move to be applied to data that has a higher valuethan other data, data that is more often used than other data, etc.

The method 400 may further include, based on the quality indexes,determining high quality operations based on a quality of a dataset. Forexample, certain operations are good, or high quality, for use with lowquality data because the low quality data has enough information for theparticular operation. For example, the particular operations identifiedmay be only focused on high quality aspects of the low quality dataset.For example, a dataset may be quite complete in some aspects, but lesscomplete in others. Thus, overall the dataset is of low quality, but thecomplete aspects of the dataset are of high quality.

The method 400 may be practiced where the one or more quality indexescomprises an index including quality information for a larger dataset asa whole as well as quality information for sub-datasets in the largerdataset. For example, as illustrated above in FIG. 3 above, one qualitymay be identified for the dataset 300 while distinct qualities may beidentified for the datasets 312, 314, 316 and 318 that make up thedataset 300. In some such embodiments, such a method may further includeperforming an operation on two or more of the sub-datasets to create anoutput dataset. The method may further include identifying a quality forthe output dataset based on the quality of the two or more sub-datasetsused to create the output dataset. Thus, for example, a high qualityoutput dataset may be created from a low quality dataset by using highquality constituent pieces of the dataset.

The method 400 may further include getting a high value set from two ormore low value sets. For example, two datasets that are low valuedatasets due to being low quality datasets may be combined in such asway so as to create one or more high value datasets.

In some embodiments the method may be used to create datasets ofdifferent values. For example, an actual monetary value may be assignedto a dataset based on the quality of data used to create the dataset. Insome embodiments, custom values can be created by knowing the quality ofdatasets used to create a composite dataset. For example, a consumer ata data market may be able to select between bronze quality data, silverquality data, gold quality data, or platinum quality data. The datamarket can custom tune the data quality by knowing the quality of inputdatasets to create data for the data consumer at the data market.

Further, the methods may be practiced by a computer system including oneor more processors and computer readable media such as computer memory.In particular, the computer memory may store computer executableinstructions that when executed by one or more processors cause variousfunctions to be performed, such as the acts recited in the embodiments.

Embodiments of the present invention may comprise or utilize a specialpurpose or general-purpose computer including computer hardware, asdiscussed in greater detail below. Embodiments within the scope of thepresent invention also include physical and other computer-readablemedia for carrying or storing computer-executable instructions and/ordata structures. Such computer-readable media can be any available mediathat can be accessed by a general purpose or special purpose computersystem. Computer-readable media that store computer-executableinstructions are physical storage media. Computer-readable media thatcarry computer-executable instructions are transmission media. Thus, byway of example, and not limitation, embodiments of the invention cancomprise at least two distinctly different kinds of computer-readablemedia: physical computer readable storage media and transmissioncomputer readable media.

Physical computer readable storage media includes RAM, ROM, EEPROM,CD-ROM or other optical disk storage (such as CDs, DVDs, etc), magneticdisk storage or other magnetic storage devices, or any other mediumwhich can be used to store desired program code means in the form ofcomputer-executable instructions or data structures and which can beaccessed by a general purpose or special purpose computer.

A “network” is defined as one or more data links that enable thetransport of electronic data between computer systems and/or modulesand/or other electronic devices. When information is transferred orprovided over a network or another communications connection (eitherhardwired, wireless, or a combination of hardwired or wireless) to acomputer, the computer properly views the connection as a transmissionmedium. Transmissions media can include a network and/or data linkswhich can be used to carry or desired program code means in the form ofcomputer-executable instructions or data structures and which can beaccessed by a general purpose or special purpose computer. Combinationsof the above are also included within the scope of computer-readablemedia.

Further, upon reaching various computer system components, program codemeans in the form of computer-executable instructions or data structurescan be transferred automatically from transmission computer readablemedia to physical computer readable storage media (or vice versa). Forexample, computer-executable instructions or data structures receivedover a network or data link can be buffered in RAM within a networkinterface module (e.g., a “NIC”), and then eventually transferred tocomputer system RAM and/or to less volatile computer readable physicalstorage media at a computer system. Thus, computer readable physicalstorage media can be included in computer system components that also(or even primarily) utilize transmission media.

Computer-executable instructions comprise, for example, instructions anddata which cause a general purpose computer, special purpose computer,or special purpose processing device to perform a certain function orgroup of functions. The computer executable instructions may be, forexample, binaries, intermediate format instructions such as assemblylanguage, or even source code. Although the subject matter has beendescribed in language specific to structural features and/ormethodological acts, it is to be understood that the subject matterdefined in the appended claims is not necessarily limited to thedescribed features or acts described above. Rather, the describedfeatures and acts are disclosed as example forms of implementing theclaims.

Those skilled in the art will appreciate that the invention may bepracticed in network computing environments with many types of computersystem configurations, including, personal computers, desktop computers,laptop computers, message processors, hand-held devices, multi-processorsystems, microprocessor-based or programmable consumer electronics,network PCs, minicomputers, mainframe computers, mobile telephones,PDAs, pagers, routers, switches, and the like. The invention may also bepracticed in distributed system environments where local and remotecomputer systems, which are linked (either by hardwired data links,wireless data links, or by a combination of hardwired and wireless datalinks) through a network, both perform tasks. In a distributed systemenvironment, program modules may be located in both local and remotememory storage devices.

Alternatively, or in addition, the functionally described herein can beperformed, at least in part, by one or more hardware logic components.For example, and without limitation, illustrative types of hardwarelogic components that can be used include Field-programmable Gate Arrays(FPGAs), Program-specific Integrated Circuits (ASICs), Program-specificStandard Products (ASSPs), System-on-a-chip systems (SOCs), ComplexProgrammable Logic Devices (CPLDs), etc.

The present invention may be embodied in other specific forms withoutdeparting from its spirit or characteristics. The described embodimentsare to be considered in all respects only as illustrative and notrestrictive. The scope of the invention is, therefore, indicated by theappended claims rather than by the foregoing description. All changeswhich come within the meaning and range of equivalency of the claims areto be embraced within their scope.

What is claimed is:
 1. A method comprising: performing an operation togenerate a first dataset at a first data source from a second data setat a second data source; identifying quality metadata for at least oneof the second dataset or the second data source, the quality metadatadefining one or more of the following: quality of the second data sourcein a dataflow, correctness of the second dataset by defining a measureof how well a dataset accurately reflects what the second datasetpurports to represent without errors, completeness of the second datasetby defining a measure of inclusion of predetermined elements in thesecond dataset, freshness of the second dataset by defining a measure ofhow recently data in the second dataset was produced with respect to howoften data in the second dataset is expected to change, or relevance ofthe second dataset by defining a measure of at least one of popularityof the second dataset or contextual relevance of the second dataset to asystem in which the second dataset is implemented; inferring, from thequality metadata, an inferred quality of the first dataset metadata suchthat the inferred quality of the first dataset can be inferred withoutdirect access to the data in the first dataset; determining the actualquality of the data in the first dataset; comparing the inferred qualityof the first dataset to the actual quality of the first dataset toidentify differences in the inferred quality of the first dataset andthe actual quality of the first dataset; and based on the differencesbetween the inferred quality of the first dataset compared with theactual quality of the first dataset, displaying on a user interface, anindication of an effectiveness of at least one operation in a data flow.2. The computer-implemented method of claim 1 further comprising, basedon the inferred quality of the first dataset compared with the actualquality of the first dataset, identifying one or more of positive,negative, neutral or unknown effects of one or more given operations inthe data flow.
 3. The computer-implemented method of claim 1 furthercomprising, based on the inferred quality of the first dataset comparedwith the actual quality of the first dataset, identifying incorrectquality metadata.
 4. The computer-implemented method of claim 1 furthercomprising, based on the inferred quality of the first dataset comparedwith the actual quality of the first dataset, generating reports foroperations in the data flow.
 5. The computer-implemented method of claim1 further comprising, based on the inferred quality of the first datasetcompared with the actual quality of the first dataset, identifyingoperations to be applied to different data flows.
 6. Thecomputer-implemented method of claim 1 further comprising, based on theinferred quality of the first dataset compared with the actual qualityof the first dataset, identifying resources that are at least one ofbeing underutilized or are ineffective.
 7. The computer-implementedmethod of claim 1 further comprising: selecting two or more datasetsbased on quality information; using the two or more datasets to createan output data set with a custom tailored quality level based at leaston quality information of the two more datasets; and performing at leastone operation on the two or more sub-datasets to create an outputdataset with a custom tailored quality level determined by the qualityinformation.
 8. The computer-implemented of claim 1, further comprisinggenerating a quality index that comprises quality information for alarger dataset as a whole as well as quality information forsub-datasets in the larger dataset.
 9. The computer-implemented methodof claim 8, further comprising: selecting two or more of thesub-datasets based on quality information in the quality index to beused to create an output data set with a custom tailored quality leveldependent on the quality information stored in the quality index; andperforming at least one operation on the two or more sub-datasets tocreate an output dataset with a custom tailored quality level determinedby quality information in the quality index for the two or moresub-datasets.
 10. A computer program product comprising a computerstorage device containing computer-executable instructions which, whenexecuted by one or more processors, cause the one or more processors toperform a computer-implemented method comprising: performing anoperation to generate a first dataset at a first data source from asecond data set at a second data source; identifying quality metadatafor at least one of the second dataset, or the second data source, thequality metadata defining one or more of the following: quality of thesecond data source in the dataflow, correctness of the second dataset bydefining a measure of how well the second dataset accurately reflectswhat the dataset purports to represent without errors, completeness ofthe second dataset by defining a measure of inclusion of predeterminedelements in the second dataset, freshness of the second dataset bydefining a measure of how recently data in the second dataset wasproduced with respect to how often data in the second dataset isexpected to change, or relevance of the second dataset by defining ameasure of at least one of popularity of the second dataset orcontextual relevance of the second dataset to a system in which thesecond dataset is implemented; inferring, from the quality metadata, aninferred quality of the first dataset metadata such that the inferredquality of the first dataset can be inferred without direct access tothe data in the first dataset; determining the actual quality of thedata in the first dataset; comparing the inferred quality of the firstdataset to the actual quality of the first dataset to identifydifferences in the inferred quality of the first dataset and the actualquality of the first dataset; and based on the differences between theinferred quality of the first dataset compared with the actual qualityof the first dataset, displaying on a user interface an indication of aneffectiveness of at least one operation in a data flow.
 11. The computerprogram product of claim 10 wherein the computer-implemented methodfurther comprises, based on the inferred quality of the first datasetcompared with the actual quality of the first dataset, identifying oneor more of positive, negative, neutral or unknown effects of one or moregiven operations in the data flow.
 12. The computer program product ofclaim 10 wherein the computer-implemented method further comprises,based on the inferred quality of the first dataset compared with theactual quality of the first dataset, identifying incorrect metadata. 13.The computer program product of claim 10 wherein thecomputer-implemented method further comprises, based on the inferredquality of the first dataset compared with the actual quality of thefirst dataset, identifying resources that are at least one of beingunderutilized or are ineffective.
 14. The computer program product ofclaim 10 wherein the computer-implemented method further comprises,based on the inferred quality of the first dataset compared with theactual quality of the first dataset, determining high qualityoperations.
 15. The computer program product of claim 10 wherein thecomputer-implemented method further comprises generating a quality indexcomprising quality information for a larger dataset as a whole as wellas quality information for sub-datasets in the larger dataset.
 16. Thecomputer program product of claim 15 wherein the computer-implementedmethod further comprises: selecting two or more of the sub-datasetsbased on quality information in the quality index to be used to createan output data set with a custom tailored quality level dependent on thequality information stored in the quality index; and performing at leastone operation on the two or more sub-datasets to create an outputdataset with a custom tailored quality level determined by qualityinformation in the quality index for the two or more sub-datasets.
 17. Acomputing system comprising: one or more processors; a computer programproduct comprising a computer storage device containingcomputer-executable instructions which, when executed by one or moreprocessors, cause the one or more processors to implement acomputer-implemented method comprising: performing an operation togenerate a first dataset at a first data source for a data flow from asecond data set at a second data source in the data flow; identifyingquality metadata for at least one of the second dataset, or the seconddata source, the quality metadata defining one or more of the following:quality of the second data source in the dataflow, correctness of thesecond dataset by defining a measure of how well the second datasetaccurately reflects what the second dataset purports to representwithout errors, completeness of the second dataset by defining a measureof inclusion of predetermined elements in the second dataset, freshnessof the second dataset by defining a measure of how recently data in thesecond dataset was produced with respect to how often data in the seconddataset is expected to change, or relevance of the second dataset bydefining a measure of at least one of popularity of the second datasetor contextual relevance of the second dataset to a system in which thesecond dataset is implemented; inferring, from the quality metadata, aninferred quality of the first dataset metadata such that the inferredquality of the first dataset can be inferred without direct access tothe data in the first dataset; determining the actual quality of thedata in the first dataset; comparing the inferred quality of the firstdataset to the actual quality of the first dataset to identifydifferences in the inferred quality of the first dataset and the actualquality of the first dataset; and based on the differences between theinferred quality of the first dataset compared with the actual qualityof the first dataset, displaying on a user interface an indication of aneffectiveness of at least one operation in the data flow.
 18. The systemof claim 17, wherein the computer implemented method further comprisesgenerating a quality index that comprises quality information for alarger dataset as a whole as well as quality information forsub-datasets in the larger dataset.
 19. The system of claim 18, whereinthe computer-implemented method further comprises: selecting two or moreof the sub-datasets based on quality information in the quality index tobe used to create an output data set with a custom tailored qualitylevel dependent on the quality information stored in the quality index;and performing at least one operation on the two or more sub-datasets tocreate an output dataset with a custom tailored quality level determinedby quality information in the quality index for the two or moresub-datasets.
 20. The system of claim 18, wherein thecomputer-implemented method further comprises, based on the quality ofthe first dataset, identifying resources that are at least one of beingunderutilized or are ineffective.